Motor plow



Feb. .2 1926. 1,571,305

R. SOHNER MOTOR PLow Filed Feb. 27, 1924 2 Sheets-Sheet 11 Feb. 2 1926.

R. SOHNER MOTOR PLOW Filed Feb. 27, 1924 2 Sheets-Sheet 2 Patented Feb. 2, 1926.

ROBERT SOHNER, OF VIENNA, AUSTRIA.

MOTOR PLOW.

Application filed February 27, 1924. Serial No. 695,444. i

To all w Ito/m it may camcom.'

Be it known that I, ROBERT SOHNER, subject of the Republic of Austria, residing at Vienna X, Knollgasse 35, Austria, have invented certain new and useful Improvements in Motor Flows, of which the following is a specification.

My present invention relates to motor plows, and has particular reference to 'Ti mechanism for raising and lowering the share frame.

In motor plows of this general construction, mechanism for raising and lowering the share frame by means of power from the f. motor has heretofore been provided, but

such devices have generally been of elaborate construction, embodying complicated change gears, and as a result much annoyance has been caused by frequent defective operation, and difficulty has been encountered in properly operating and supervising the raising and lowering of the share frame.

An object of the present invention is to provide a `mechanism of this character which is of relatively simple construction, and positive in operation.

A feature of the invention lies in providing means for lifting the share by means of power from the motor, and permitting the lowering of the frame to a predetermined furrow depth to be effected by the force of gravity.

Another feature of the invention lies in providing means for locking the frame automatically to hold it in a predetermined raised posit-ion, and in providing adjustable means for automatically limiting the fall of l the frame to a predetermined amount when the locking means has been disengaged to permit the frame to fall of its own weight.

For the attainment of the foregoing objects, and such other objects as may hereinafter appear or be pointed out, I have illustrated one embodiment of my invention in the accompanying drawings, in which- Fig; 1 is a longitudinal cross-section through the mechanism, the share frameV being omitted ;i

ari

Fig. 2 is a plan view voffa portion of a motor plow equipped with my improved device;

Fig. 3 is a cross-sectional view taken along the-line III-III of Fig. 1;` and Fig.H 4 is a cross-sectional view taken aloiig'the line IV-IV of Fig. 2.

Referring-novi t the' drawings, I have shown a chassis frame 1 of a motor plow, carrying a share frame 2 provided with shares 3 arranged toward the rear ofthe chassis 1 in a well-known manner. The share frame 2 may be attached toward the front of the chassis by any suitable wellknown means.

A lifting gear o@ is provided to operate directly or indirectly upon the share frame 2, and is arranged to be operatively, yet disengageably, connected with the engine shaft 4 by means of a clutch la. In the illustrated embodiment, I have shown the clutch 7a as a friction clutch, the driving part 10 being provided with peripheral teeth 11 engaging constantly with a worm 12 keyed upon a shaft 13 driven by the engine shaft. The shaft 13 is mounted in bearings 14`provided in a casing 15 which encloses the entire clutch k. The shaft 13 is operatively coupled to the engine shaft. 4 by means of a universal joint 17. The driven part 2O of the clutch 70 is splined by means of keyways 21 upon a transverse shaft 22 leading to the lifting gear m. Y

When the clutch cis engaged, the lifting gear w is driven directly from the motor by means of the shaft 4, the shaft 13, the clutch r, and the shaft 22. The clutch is provided with a control lever which comprises a bent lever 25 pivoted to the casing 15 at 26, and provided with a forked end portion 251 adapted to engage a sliding sleeve 27 carried by the driven part 2O of the clutch. The other arm 2511 of the lever 25 is operatively articulated to a rod 28 leading to a suitable control member such as a pedal arranged within the drivers reach. The spring 29 extends between the arm 2511 and a fixed point on the chassis frame 1 to normally hold the lever 25 in a position disengaging the clutch 76,' that is, the rod 28 acts upon the lever 25 against the tension of the spring 29.

` The lifting gear w comprises a pinion carried by the shaft 22 and engaging a toothed member or rack 36, the latter being slidably mounted in fixed guides 37 andl connected by means of a pin 38 (Fig. 4) with t.heshare frame 2';

The automatic lockingmea'ns for, retaining the share frame in a predetermined raised`r` position comprise'spreferablya shoulder 40 provided on the rack 36, and a pawl 41, pivoted as at` 42, adapted to cooperate and @Haase with the .shoulder 40. Theipawl coupledffronr the shaft 13.` Thefshaft `62\isto urge the pawl proper constantly againstk the rack 36 so that whenfthe shoulder 4() assumes a position adjacent tothe pawl 41 the latter will be urged'and will remain in engagement with the shoulder 40.

f vAdjustable means .are provided for auto'- matically` limiting the fall of the share frame 2 to a predetermined amount when the locking` device 4l is disengaged, and this auto matic' controlmeans,.indicated generally by the reference numeral e, comprises preferably adjustable stop bolts removably insertable'at desired points, such `as holes 50 provided in the rack 36,and adapted to encounter affixed point, preferably theupperend of the fixed guide 3T, when the share frame 2 andthe rack 36 drop by their ownk weight. Tlius,vin the illustrated embodiment, I have shown a'stopfbolt 5l removably inserted into one of the holes 50, and adaptedl to engage the fixed stop 52 constitutedby the upper edge 'of the guide 37.. Y

The lifting gear ar is also provided with means for automatically disengaging the clutch when the share frame'Q has been lifted to a predetermined raised position. This disenaging` means is preferably carried by the 'toot-hed member 36, and comprises preferably a portion constituting; a cam surface 53 cooperating with the lever 25 which is disposed to lie within the path of' movement of the surface 53. More specifically, thel lever 25 is guided in a vslot 54 in such a manner that it can move sidewise, but not upwards or downwards. Adjacent to the. cam Asurface 53, li provide a locking surface 55 'parallel to the direction of movement of the rack 35; and the cam surfaces 53 and 55 areso arranged that when the pawl 4l 1s in engagement beneathv the shoulder 40, 4the lever 25 will lie in engagement-with the locking-surface By this means, the lever 25 is firmly retained in disengaged position.

The extension sliaft"l3 carries at its rear end u connecting' pin -60 adaptedto be coupled with a coupling` sleeve 6l of the clutchdevice 1w. The sleeve 6l is carried' by a shaft 62 mounted 'to slide axiallyfand carrying a-clutchfi63 constantly acted'upon'by a spring 64 to keep the device "w normallyun provided at its rear end with; a crank 65. Ther-device operatesas-f0lloWs:-'

'llhe 'clutch-7c is normally1 heldrin disen`v gagged position-by the spring 29- whichV acts *uponthejlever 25. lIf it is desired to raise theshareframe, .the operator actuates the engage the clutch le. Operative connection will then be established between the motor and the shaft 22, and the pinion 35 will operate to raise the rack 36 carrying with it the share frame 2. As the rack 36 approaches its highest position, the cam surface 53 encounters the lever 25 and engages the latter to move,` it in the slot 54 in a direction to disengage the clutch la'. The clutch 7c is not entirely disengaged lhowever until the locking Cam surface 55 has reached the'point alongside `of the lever 25'to retain it in its extreme disengaged position. `Simultaneously, the shoulder 40 lwill have. assumed a position immediately above the pawl 4l, and the latter, under the action of the spriug45, will snap into place beneath and inengageyment with the shoulder 40, thereby retaining and lockingthe rack 36 (and the share frame el in its highest position. It will be' noted that this locking device is entirely independent of the driving mechanism, the entire weight of the share frame being carried by the pawl 4l. Then it is desired to lower the share frame, the driver of the plow oper ates the rod 43 fagainst the Vaction of the spring 45 to withdraw the pawl 41 from engagement with the shoulder 40. As a result, the share frame and the rack will fall by their own weight. The'amount of their descent willfbe limited however to a predetermined adjustable amount by virtue of the fact that 'the bolt 5l will strike the'i-xed stop 5.Z.`k The-boltl-*will have been previously inserted into a'desired openingl 50 depending upon the depth of furrow which is required;

By virtue' of this construction and 'arrangement, the movement of the shares 3 can be positively -controlled with grcat'case and in a manner whereby almost immediate' response is"secur`ed.f Merely operating` the rod-23 will serve to' raise the shares quickly l and expeditiously; aiidfafter'they .have been raised, and retained-in raised position, the mere ope-rationof the rod 43 will cause them to drop almost' Yinsta-ntaneously to a predetermineddepth,` f v It will-'be obvious that various details in the construction vherein illustrated and described for the purpose of 'explaining the nature ofmy invention' may be altered and change'dfbyythose skilled in the art without departing` *fromw thespirit and scope of the invention-nas expressed in the appended claims. It is*thereforerintendedthat these details be interpreted as illustrative and" Iiot'in alimiiting'sensej l. In a motor plow, the combination with ashare frame, of means includinga toothed memberand disengageably 'operatively con# nected tos-the motor for lifting said frame, and meanscarried 'by said member for auto- 1natieally-fdi'sengaging said'k rst'- named niv/1,305

means from said motor when the Aiframe has been. raised to a predetermined position.

2. In a motor plow, the combination with a share trame, ci means including a toothed member carried by the lframe and disengageably operatively connected to the motor for lifting said frame, means carried by said member for automatically disengaging said iirst named means trom said motor when the trame has been raised to a predetermined position, and means cooperating with Said member for automatically locking said i'rame in said raised position.

In a motor plow, the combination with a share trame, of means including a toothed member carried by the trame and disengageably operatively connected to the motor for lifting said iframe, means carried by said member tor automatically disengaging said l'irst named means from said motor when the iframe has been raised to a predetermined position, means cooperating` with said member tor automatically locking said frame in said raised position, and adjustable mea-ns carried by said member for automatically limiting'the fall ot the frame to a predetermined amount when the locking means is disengaged to permit the frame to fall of its own weight.

il. In a motor plow, the combination with a share trame, of means for lifting the traine and comprising a toothed rack connected with the 'frame and a pinion meshing therewith, a clutch ttor operatively engaging or disengaging said means with the mo tor, and means carried by said rack and adapted to cooperate with said clutch for automatically -disengaging the latter when the trame has been raised to apredetermined position.

5. In a motor plow, the combination with a share trame, of mechanism for raising the lrame by the motor, said mechanism comprising a toothed rack connected with the iframe, a pinion meshing with the rack, a clutch for establishing operative connec tion between the pinion and the motor, means carried by the rack for automatically disengaging said clutch when the frame has been raised to a predetermined position, and

ieans cooperating with the rack for automatically locking the frame in said raised position.

6. In a motor plow, the combination with a share trame, of a toothed rack connected therewith, a i'iXed guide therefor, a` pinion meshing with the rack and drivable by the motor to litt the -trame, means cooperating with the rack for automatically locking the trame in a predetermined raised position, and adjustable stops carried by the rack and adapted to encounter said iiXed guide when the locking means is disengaged to permit the frame to tall by its own weight.

7. In a motor plow, the combination with a share trame., of a toothed rack connected therewith, a fixed guide therefor, a pinion meshing with the rack and drivable by the motor to lift the frame, means cooperating with the rack ior automatically locking the traine in a predetermined raised position, said rack having a plurality of openings therein, and a stop bolt removably inserted in one of said openings and adapted to encounter the iixed guide to limit the fall oi' the frame by its own weight when the locking mieans is disengaged.

S. In a motor plow, the combination with a share frame, of a toothed rack connected with the 'frame and having a shoulder, a pinion meshing with the rack, means for driving the pinion by the motor to lift the trame, and means cooperating with the rack tor automatically locking the trame in a predetermined raised position, said last named means comprising a pawl automatically miovable into engagement with said shoulder.

9. In a. motor plow, the combination with a share frame, of a toothed rack connected with the frame, a pinion meshing with the "ack, and a. clutch including a control lever tor establishing operative connection between the pinion and the motor to lift the trame, said rack having a portion constituting a cam surface adapted to encounter and move said lever to disengage the clutch when the frame is in a predetermined position.

10. In a motor plow, the combination of elements as set forth in claim 9, said cam surface being oi a shape to retain said clutch in disengaged position while the frame is in said raised position.

In testimony whereof I affix my signature ING. HUBERT SOHNER,

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